Disneyland Paris is exceptionally "worth it" for a 3-year-old, primarily because they fall into the "Magic Age" where the line between reality and fantasy is beautifully blurred. At this age, meeting Mickey Mouse or seeing the Princesses in the "Stars on Parade" is a life-changing event rather than just a photo op. Practically, children under 3 are free, so a trip right around the third birthday is very cost-effective. The park features dozens of attractions with no height requirement, such as "it's a small world," Peter Pan's Flight, and the Lancelot Carousel, which are perfect for toddlers. Disneyland Paris also offers excellent Baby Care Centers for quiet breaks and diaper changes. While the child may not remember every detail years later, the "magical" photos and the pure joy they experience in the moment often make the trip a core memory for the parents. Just remember to utilize the "Rider Switch" program so parents can still enjoy the big thrills like Hyperspace Mountain while the 3-year-old takes a nap in the stroller.